Bessie

#include <iostream>
#include <vector>
#include <fstream>

using namespace std;

int main()
{
    ifstream in("billboard.in");
    ofstream out("billboard.out");

    int x1m, x2m, y1m, y2m, x1b, x2b, y1b, y2b;

    in >> x1m >> y1m >> x2m >> y2m >> x1b >> y1b >> x2b >> y2b;

    int cm = 0;
    int cmm = 0;

    vector < vector <char> > bill(2002, vector <char>(2002, '*'));

    for(int i = (x1m + 1000); i <= (x2m + 1000); i++)
        for(int j = (y1m + 1000); j <= (y2m + 1000); j++, cmm++)
            bill[i][j] = 'M';

    for(int i = (x1b + 1000); i <= (x2b + 1000); i++)
        for(int j = (y1b + 1000); j <= (y2b + 1000); j++)
            if(bill[i][j] == 'M')
                cm++;

    out << (cmm - cm) << endl;

    in.close();
    out.close();

    return 0;
}